This is true to at least my case: grew up under the metric system and after 15 years living in the US, still have to mentally convert dimensions to metric in order to make sense of them:
- If you point at something and ask me how far it is, the first number that comes to my mind is in meters, then I say that number and add "yards" or mentally multiply it by 3 and add "feets"
- If you ask me to grab something and give you the weight, the number comes in Kg and I mentally multiply it by 2.2 to give and approximate weight in pounds.